Size:
General Distribution: Southern United States from Florida and Georgia west to Central Texas and Oklahoma, and from California to Arizona? May also be present in New Mexico, but so far all "brown widows" have proven to be color variants of Latrodectus hesperus.
Distribution in Area Covered: AZ: Reported from Maricopa County
Habitat: Webs in association with human habitation
Adults Present: Probably year around.
Notes: The brown widow. Egg sacs tufted with silk as opposed to the black widow species, which have smooth sacs.
Records:
Reference:

Size: 2.35 mm
General Distribution: Widely distributed in N. America, less common in western half
Distribution in Area Covered: AZ: Apache
Habitat: Found near water
Adults Present: Mar-Oct
Notes:Despite name, species is dark-colored
Records: Ivie 1969
Reference: Ivie 1969

Size:
General Distribution: Eastern Canada and New England west to Oregon and south to New Mexico.
Distribution in Area Covered: NM: Los Alamos.
Habitat:
Adults Present:
Notes:
Records: Lowrie 1985.
Reference: Lowrie 1985.

Halorates stylifer Chamberlin (= Catabrithorax s.)

Size:
General Distribution: West United States N to Alaska. New Mexico?
Distribution in Area Covered:
Habitat:
Notes:
Records: ??
Reference: Vogel? 1967.

Size:
General Distribution: New York and New Hampshire west to Utah and New Mexico.
Distribution in Area Covered: NM: Los Alamos.
Habitat:
Adults Present:
Notes:
Records: Lowrie 1985.
Reference: Lowrie 1985.

Size: Male 3.8 mm, female 5.3 mm
General Distribution: Western Florida to central California, south to Panama
Distribution in Area Covered: AZ: Santa Cruz
Habitat: Webs on shrubs and trees, such as mesquite, junipers and elms
Adults Present: Male May-October, female March- October
Notes: Used as the type species for the genus Cambridgepeira by Archer (1951)
Records: Levi 1973
Reference: Levi 1973